Injection mold capable of preventing demolding scratch

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold capable of preventing demolding scratches. The injection mold capable of preventing demolding scratch comprises an upper mold and a lower mold, the upper die comprises an upper die plate and an upper die core plate, the upper die core plate is provided with a plurality of cavities, and waste grooves are formed in the outer sides of the cavities. The lower die comprises a lower die base, a lower die plate and a lower die core plate. The lower mold core plate is provided with a main runner, branch runners and a plurality of mold cores; first ejector pins are arranged on the outer sides of the mold core, the main runner, the branch runners and the mold core; the inclined ejection mechanism comprises a sliding block and a spring rod, the spring rod is connected with the sliding block, and the insert is arranged on the sliding block; and the wedge-shaped block can extrude the inclined surface of the sliding block, so that the insert and the mold core are closed together. When the mold is opened, the first ejector pin simultaneously ejects the product at the mold core position and the multiple waste material positions instead of independently ejecting the product, so that the product can be effectively prevented from being scratched and damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold capable of preventing mold release and scratching. Background Art

[0002] Injection molds are used to produce shells for various electronic devices (such as mobile phone shells, earphone shells, tablet shells, earphone shells, mobile phone mid-plates, earphone stands, etc.). Mobile phone shells, earphone shells, tablet shells, etc. are usually thin, perhaps only about 1mm, and on very thin shells, screw holes, connection holes and other holes need to be formed. This type of shell is a combination of thin walls and holes. After the product is formed, it is usually ejected directly using vertical ejectors and inclined ejectors. However, it was found during production that when using vertical ejectors and inclined ejectors to eject the product directly, the product may still be scratched or damaged.

[0003] For example, Chinese patent application number: CN202120084414.2 discloses a protective case injection mold, which uses an inclined top and a vertical top to directly eject the product, which may cause the product to be scratched or damaged.

[0004] Another example is the mobile phone protective case and its mold disclosed in Chinese patent application number: CN201420008581.9, which directly ejects the product by means of an inclined ejection and a vertical ejection, and the product may also be scratched or damaged. Utility Model Content

[0005] In view of this, the utility model aims to solve the deficiencies in the prior art, and its main purpose is to provide an injection mold that is anti-mold demolding and scratching. The ejection structure and ejection position are optimized to prevent product scratches and ejection damage, and the work efficiency is higher, thereby overcoming the shortcomings of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The present application provides an injection mold for preventing demoulding and scratching, comprising an upper mold and a lower mold; the upper mold comprises an upper mold plate and an upper mold core plate, the upper mold core plate is arranged on the upper mold plate, the upper mold core plate is provided with a plurality of cavities, and a waste groove is arranged on the outer side of the cavity; the corners of the upper mold plate are provided with a first guide column; the middle part of the upper mold plate is provided with a wedge block and an inclined second guide column;

[0008] The lower mold comprises a lower mold base, a lower mold plate, and a lower mold core plate; the lower mold plate is arranged on the lower mold base, and the lower mold core plate is arranged on the lower mold plate; the lower mold plate is provided with a first guide post hole, and the first guide post can be inserted into the first guide post hole;

[0009] The lower mold core plate is provided with a main flow channel, a branch flow channel, and a plurality of cores, wherein the branch flow channel is connected to the main flow channel; a material guide seat is provided at the entrance of the main flow channel, and an arc groove is provided in the material guide seat to communicate with the main flow channel; a first ejector is provided on the outer side of the core corresponding to the core, the main flow channel, the branch flow channel, and the waste groove; an insert is provided on the outer side of the core;

[0010] The inclined ejector mechanism includes a slider and a spring rod. The lower template is provided with an inclined slide groove, and the slider can slide in the slide groove. The spring rod is connected to the slider, and the insert is arranged on the slider; the slider is provided with a second guide column hole, and the second guide column can be inserted into the second guide column hole; the wedge block can squeeze the inclined surface of the slider, and the insert can be closed together with the core.

[0011] Preferably, the branch channel is Y-shaped or V-shaped.

[0012] Preferably, there is one main flow channel and four branch flow channels, and the branch flow channels are symmetrically connected to the main flow channel.

[0013] Preferably, the first ejector pin and the reset rod are arranged on the first top plate, and the second top plate is arranged on the first top plate; the reset rod can be squeezed by the upper template.

[0014] Preferably, at least two first cooling tubes pass through the upper mold core plate, and at least two second cooling tubes pass through the lower mold core plate.

[0015] Preferably, the lower mold core plate is provided with an exhaust groove, which is communicated with the waste groove.

[0016] Preferably, the exhaust groove is in one of a linear shape, an L shape and a T shape.

[0017] Preferably, outer walls of the first guide pillar and the second guide pillar are provided with textures, and lubricating oil is adhered to the textures.

[0018] Preferably, a replaceable extrusion block is provided on the wedge block.

[0019] Preferably, the sliding block is provided on both sides of the sliding block, a limiting groove is formed between the inner side wall of the sliding groove and the mounting block, and the limiting block slides in the sliding groove.

[0020] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that when the upper mold and the lower mold are closed, the wedge block set in the middle of the upper mold plate will squeeze the slider of the inclined ejection mechanism, so that the insert and the core are closed together. When the product is opened for injection molding, the slider moves obliquely downward under the action of the spring rod, so that the insert is pulled out of the product to prevent damage to the hole; then the ejector ejects the product. This work efficiency is more efficient, coordinated, and the structure is simple. Since the core, the main channel, the branch channel, and the outer side of the core corresponding to the waste groove are all provided with a first ejector, the ejection position of the first ejector is at the waste position and the product position, rather than being pushed on the product alone. Therefore, the first ejector arranged at multiple points is ejected as a whole at the waste position and the product at the same time, which can effectively avoid scratches and damage to the product when it is demolded. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view schematic diagram of an embodiment of the utility model.

[0022] Figure 2 It is a schematic cross-sectional view of the mold clamping of an embodiment of the utility model.

[0023] Figure 3 It is a schematic cross-sectional view of a mold opening of an embodiment of the utility model.

[0024] Figure 4 It is a schematic diagram of the lower mold of an embodiment of the utility model.

[0025] Figure 5 It is a schematic top view of the lower mold of an embodiment of the utility model.

[0026] Figure 6 It is a bottom view of the upper mold of an embodiment of the utility model.

[0027] Description of the accompanying drawings:

[0028] 10. Upper die; 11. Upper die plate; 12. Wedge block; 13. Extrusion block; 14. Upper die core plate; 15. Cavity; 16. Waste chute; 17. First cooling pipe; 110. First guide post; 111. Second guide post; 112. Texture; 20. Lower die; 21. Lower die seat; 22. Lower die plate; 23. Slide; 25. First guide post hole; 210. Lower die core plate; 211. Material guide seat; 212 , main channel; 213, branch channel 214, core; 215, exhaust groove; 216, insert; 217, second cooling pipe; 218, arc groove; 220, first top plate; 221, second top plate; 222, first ejector pin; 223, reset rod; 30, inclined ejector mechanism; 31, slider; 32, limit block; 33, mounting block; 34, limit groove; 35, spring rod; 36, second guide column hole. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0030] Please refer to Figures 1 to 6 As shown, it shows the specific structure of the preferred embodiment of the utility model, which is an injection mold that prevents demoulding and scratching.

[0031] When the mold is opened, the spring rod 35 pushes the slider 31 to move obliquely downward, so that the insert 216 is pulled out from the product hole, and then the ejector ejects the product. This work efficiency is more efficient and coordinated. The ejection position of the first ejector 222 is on the waste formed at the outer position of the core 214, the main channel 212, the branch channel 213, and the core 214, instead of being pushed on the product alone. Multiple ejectors are ejected as a whole at the waste and product positions, which can effectively prevent the product from being scratched and damaged.

[0032] The present application provides an injection mold for preventing demoulding and scratching, comprising an upper mold 10 and a lower mold 20; the upper mold 10 comprises an upper mold plate 11 and an upper mold core plate 14, the upper mold core plate 14 is arranged on the upper mold plate 11, and the upper mold core plate 14 is provided with a plurality of cavities 15, and a waste groove 16 is arranged on the outer side of the cavity 15; the corners of the upper mold plate 11 are provided with a first guide column 110; the middle part of the upper mold plate 11 is provided with a wedge block 12 and an inclined second guide column 111;

[0033] The lower mold 20 includes a lower mold base 21, a lower mold plate 22, and a lower mold core plate 210; the lower mold plate 22 is disposed on the lower mold base 21, and the lower mold core plate 210 is disposed on the lower mold plate 22; the lower mold plate 22 is provided with a first guide post hole 25, and the first guide post 110 can be inserted into the first guide post hole 25;

[0034] The lower mold core plate 210 is provided with a main channel 212, a branch channel 213, and a plurality of cores 214, wherein the branch channel 213 is connected to the main channel 212; a material guide seat 211 is provided at the entrance of the main channel 212, and an arc groove 218 is provided in the material guide seat 211 to communicate with the main channel 212; a first ejector pin 222 is provided on the outer side of the core 214 corresponding to the main channel 212, the branch channel 213, and the waste groove 16 (referring to the side prevention of the core 214); an insert 216 is provided on the outer side of the core 214;

[0035] The tilting mechanism 30 includes a slider 31 and a spring rod 35. The lower mold plate 22 is provided with an inclined slide groove 23. The slider 31 can slide in the slide groove 23. The spring rod 35 connects the slider 31. The insert 216 is provided on the slider 31. The slider 31 is provided with a second guide post hole 36. The second guide post 111 can be inserted into the second guide post hole 36. The wedge block 12 and the insert 216 can be closed together with the core 214. The injection mold is provided in an injection molding machine. When the upper mold 10 and the lower mold 20 are molded together, the first guide post 110 is inserted into the first guide post hole 25, and the second guide post 111 is inserted into the second guide post hole 36 to ensure the mold closing accuracy. The wedge block 12 presses the inclined surface of the slider 31 downward, so that the insert 216 and the core 214 are closed together. After the upper mold 10 and the lower mold 20 are closed, the injection plastic is injected from the injection port on the upper mold plate 11, and then enters the main channel 212, the branch channel 213, and the cavity 15 in sequence from the material guide seat 211. The injection plastic is cooled and formed in the cavity 15. After the mold is opened, the wedge block 12 moves upward to release the slider 31, and the slider 31 slides obliquely downward under the action of the spring rod 35, and then the core 214 is pulled out from the hole of the product, and then the ejector ejects the product from the cavity 15. This working step is efficient and can avoid damage to the hole of the product. When the injection plastic fills the cavity 15, waste (sprue material) is injected into the main channel 212, the branch channel 213, and the waste groove 16. After the mold is opened, the ejector pin ejects the product as a whole at multiple positions such as the core 214, the main channel 212, the branch channel 213, and the waste at the waste groove 16, instead of pushing it on the product alone. Therefore, the first ejector pin 222 arranged at multiple points ejects the product as a whole at the product and waste positions at the same time, which can effectively avoid scratches and damage to the product. The waste groove 16 and the exhaust groove 215 are connected to the cavity 15. The waste groove 16 and the exhaust groove 215 are also conducive to allowing the injection plastic to quickly fill the cavity 15 without the problem of gas.

[0036] Preferably, the runner 213 is Y-shaped or V-shaped. The runner 213 in this embodiment is Y-shaped, and each cavity 15 is connected to at least one runner 213. The Y-shaped runner 213 is conducive to allowing the injection plastic to fill the cavity 15 more quickly. In this embodiment, there is one main channel 212, and four runners 213. The runners 213 are symmetrically connected to the main channel 212; there are four cavities 15, and each cavity 15 is connected to a runner 213. This design allows the injection mold to produce multiple products at a time, with higher production efficiency.

[0037] Preferably, the first ejector pin 222 and the reset rod 223 are arranged on the first ejector plate 220, and the second ejector plate 221 is arranged on the first ejector plate 220; the reset rod 223 can be squeezed by the upper mold plate 11. The machine drives the first ejector plate 220 and the second ejector plate 221 to move up and down. When the mold is closed, the upper mold plate 11 presses on the reset rod 223, so that the first ejector plate 220 and the second ejector plate 221 move downward, which can ensure that the ejector pin can be completely withdrawn from the core 214.

[0038] Preferably, at least two first cooling pipes 17 pass through the upper mold core plate 14, and at least two second cooling pipes 217 pass through the lower mold core plate 210. There are two first cooling pipes 17 and two second cooling pipes 217 filled with cooling medium. After the mold is injected, the upper mold core plate 14 and the lower mold core plate 210 can be quickly cooled, which is conducive to rapid molding of the product. The shape of the first cooling pipe 17 and the second cooling pipe 217 is one of a straight line, an L shape, and an F shape.

[0039] Preferably, the lower mold core plate 210 is provided with an exhaust groove 215, which is connected to the waste groove 16. The exhaust groove 215 is one of a linear shape, an L shape, and a T shape. When the mold is closed, the exhaust groove 215 is connected to the cavity 15, which is conducive to the discharge of gas in the cavity 15 and the molding of the product. The exhaust groove 215 in this embodiment is L-shaped, which can prevent waste from being ejected, and at the same time allow the gas in the cavity 15 to be discharged in time.

[0040] Preferably, the outer walls of the first guide pillar 110 and the second guide pillar 111 are provided with lines 112, and lubricating oil is adhered to the lines 112. This design can reduce the wear of the first guide pillar 110 and the second guide pillar 111 and increase the service life of the mold.

[0041] Preferably, a replaceable extrusion block 13 is provided on the wedge block 12. The extrusion block 13 can be directly replaced after being worn, and maintenance is very convenient.

[0042] Preferably, the slider 31 has limit blocks 32 on both sides, and a limit groove 34 is formed between the inner side wall of the slide groove 23 and the mounting block 33, and the limit block 32 slides in the slide groove 23. The limit block 32 can limit the movement track of the slider 31. During maintenance, the slider 31 can be removed by removing the mounting block 33, and the insert 216 can also be replaced. This design is conducive to improving the convenience of maintenance.

[0043] In summary, the design focus of the utility model is that its spring rod 35 can push the slider 31 to move obliquely downward, so that the insert 216 can be pulled out from the product hole, which can prevent the product hole from being damaged, and the work efficiency is more efficient and coordinated. The ejection position of the first ejector 222 is on the waste formed by the outer position of the core 214, the main channel 212, the branch channel 213, and the core 214. Multiple ejectors are ejected at the waste position and the product position at the same time, which can effectively prevent the product from being scratched and damaged.

[0044] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An injection mold that prevents demoulding and scratching, characterized in that: The upper mold comprises an upper mold and a lower mold; the upper mold comprises an upper mold plate and an upper mold core plate, the upper mold core plate is arranged on the upper mold plate, the upper mold core plate is provided with a plurality of cavities, and a waste groove is arranged on the outer side of the cavity; the corners of the upper mold plate are provided with a first guide column; the middle part of the upper mold plate is provided with a wedge block and an inclined second guide column; The lower mold comprises a lower mold base, a lower mold plate, and a lower mold core plate; the lower mold plate is arranged on the lower mold base, and the lower mold core plate is arranged on the lower mold plate; the lower mold plate is provided with a first guide post hole, and the first guide post can be inserted into the first guide post hole; The lower mold core plate is provided with a main flow channel, a branch flow channel, and a plurality of cores, wherein the branch flow channel is connected to the main flow channel; a material guide seat is provided at the entrance of the main flow channel, and an arc groove is provided in the material guide seat to communicate with the main flow channel; a first ejector is provided on the outer side of the core corresponding to the core, the main flow channel, the branch flow channel, and the waste groove; an insert is provided on the outer side of the core; The inclined ejector mechanism includes a slider and a spring rod. The lower template is provided with an inclined slide groove, and the slider can slide in the slide groove. The spring rod is connected to the slider, and the insert is arranged on the slider; the slider is provided with a second guide column hole, and the second guide column can be inserted into the second guide column hole; the wedge block can squeeze the inclined surface of the slider, and the insert can be closed together with the core.

2. The anti-scratch injection mold according to claim 1, characterized in that: The branch channel is Y-shaped or V-shaped.

3. An anti-scratch injection mold according to claim 1 or 2, characterized in that: There is one main flow channel, and there are four branch flow channels, and the branch flow channels are symmetrically connected to the main flow channel.

4. The anti-scratch injection mold according to claim 1, characterized in that: The first ejector pin and the reset rod are arranged on the first ejector plate, and the second ejector plate is arranged on the first ejector plate; the reset rod can be squeezed by the upper mold plate.

5. The anti-scratch injection mold according to claim 1, characterized in that: At least two first cooling pipes penetrate the upper mold core plate, and at least two second cooling pipes penetrate the lower mold core plate.

6. The anti-scratch injection mold according to claim 1, characterized in that: The lower mold core plate is provided with an exhaust groove, which is communicated with the waste groove.

7. The anti-scratch injection mold according to claim 6, characterized in that: The exhaust groove is in one of a linear shape, an L shape and a T shape.

8. The anti-scratch injection mold according to claim 1, characterized in that: The outer walls of the first guide pillar and the second guide pillar are provided with textures, and lubricating oil is adhered to the textures.

9. The anti-scratch injection mold according to claim 1, characterized in that: The wedge block is provided with a replaceable extrusion block.

10. The anti-scratch injection mold according to claim 1 or 9, characterized in that: The two sides of the sliding block are provided with limiting blocks, and a limiting groove is formed between the inner side wall of the sliding groove and the mounting block, and the limiting block slides in the sliding groove.

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